US9237621B1 - Current control circuit and method for floating IC driven buck-boost converter - Google Patents
Current control circuit and method for floating IC driven buck-boost converter Download PDFInfo
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- US9237621B1 US9237621B1 US14/589,000 US201514589000A US9237621B1 US 9237621 B1 US9237621 B1 US 9237621B1 US 201514589000 A US201514589000 A US 201514589000A US 9237621 B1 US9237621 B1 US 9237621B1
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- dimming control
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- H05B33/0851—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H05B33/0815—
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the present invention relates generally to power converters for lighting control systems. More particularly, the invention as disclosed herein relates to dimming current control for high power factor, constant current buck-boost converters.
- Buck-boost converters are conventionally very good candidates for use with wide range input voltage (120-277V), high power factor non-isolated constant current LED drivers. Such converters are relatively low cost and compact in nature.
- a typical topology, as represented for example in FIG. 1 has a drawback in that the output does not share the same ground as the control IC. This makes the current control very complicated.
- V 1 is the input AC source.
- L 1 is a common mode inductor for electromagnetic interference (EMI).
- Capacitor C 1 is an EMI filter capacitor.
- Inductor L 2 is a differential EMI inductor.
- Diodes D 1 -D 4 are input rectifier diodes for converting the AC input supply to a DC power supply.
- Capacitor C 2 is a high frequency filter capacitor for the converter.
- Resistors R 1 and R 2 define a voltage divider coupled across filtering capacitor C 2 .
- Inductor L 3 is a buck-boost inductor that stores that energy and releases it according to the control of IC.
- MOSFET Switch Q 1 is a switching element that is controlled by driver signals generated from the IC.
- Diode D 5 is a rectifier diode that bypasses the current from the primary winding L 3 p of the buck-boost inductor to output capacitor C 4 when the switching element Q 1 is off.
- the controller IC as shown in FIG. 1 typically can be a power factor control (PFC) controller IC as is known in the art, such as for example the L6562 offered by STMicroelectronics.
- the controller IC has a MULT pin that senses the input line signal via a node between the voltage dividing resistors R 1 and R 2 .
- the controller IC also has a zero current detection (ZCD) pin that is coupled to a secondary winding L 3 s of the buck-boost inductor via resistor R 3 , wherein the controller IC may ensure transition mode operation by controlling the turn on time of the switching element Q 1 .
- the controller IC also has an I sense pin that senses the current going through the switching element Q 1 and resistor R 5 .
- the controller IC further includes an internal op amp with a V sense input and COMP as output.
- C 3 is an integration capacitor for the control loop.
- V sense is a current feedback signal that comes from the load.
- the controller IC does not share the same ground as the output load, as shown in FIG. 1 .
- an expensive isolated signal coupler is typically required to transfer the real current sensing signal from the output stage to the IC stage.
- Resistor R 6 is the load current sensing resistor.
- This isolated signal coupler is not only expensive, but also introduces error and complicates the control scheme. Therefore, it would be desirable to eliminate this type of isolated signal coupler in a buck-boost converter topology.
- dimming control circuit that has the same ground as GND main so that only one dimming signal is required in order to control multiple channels of a buck-boost converter.
- the floating IC driven buck boost converter of the present invention will effectively solve this problem.
- the floating IC driven high power factor constant current buck-boost converter has a very compact size, simple control scheme, extremely low cost and high efficiency.
- a buck-boost LED driver circuit is provided with floating IC driving control.
- a DC power supply is provided with first and second inputs, the second input coupled to a mains ground.
- a PFC switching circuit is coupled to the first input and operable to drive an LED load.
- a current sensor is coupled to the switching circuit and configured to provide feedback signals representative of current through the LED load, and a dimming control circuit is coupled to the mains circuit ground and effectively superposes an external dimming control signal with the load feedback signal.
- a PFC controller is configured to provide driver signals to a switching element based on the superposed dimming and load feedback signals as compared to an internal reference. Each of the switching element, the current sensor and the controller are commonly coupled to a floating circuit ground.
- FIG. 1 is a circuit block diagram representing a high power factor constant current buck-boost converter as conventionally known in the art.
- FIG. 2 is a circuit block diagram representing an embodiment of a power converter current control circuit topology according to the present invention.
- FIG. 3 is a circuit block diagram representing another embodiment of a power converter current control topology according to the present invention.
- FIG. 4 is a circuit block diagram representing an embodiment of dimming current control system according to the present invention.
- Coupled means at least either a direct electrical connection between the connected items or an indirect connection through one or more passive or active intermediary devices.
- circuit means at least either a single component or a multiplicity of components, either active and/or passive, that are coupled together to provide a desired function.
- Terms such as “wire,” “wiring,” “line,” “signal,” “conductor,” and “bus” may be used to refer to any known structure, construction, arrangement, technique, method and/or process for physically transferring a signal from one point in a circuit to another.
- the terms “known,” “fixed,” “given,” “certain” and “predetermined” generally refer to a value, quantity, parameter, constraint, condition, state, process, procedure, method, practice, or combination thereof that is, in theory, variable, but is typically set in advance and not varied thereafter when in use.
- switching element and “switch” may be used interchangeably and may refer herein to at least: a variety of transistors as known in the art (including but not limited to FET, BJT, IGBT, JFET, etc.), a switching diode, a silicon controlled rectifier (SCR), a diode for alternating current (DIAC), a triode for alternating current (TRIAC), a mechanical single pole/double pole switch (SPDT), or electrical, solid state or reed relays.
- SCR silicon controlled rectifier
- DIAC diode for alternating current
- TRIAC triode for alternating current
- SPDT mechanical single pole/double pole switch
- FET field effect transistor
- BJT bipolar junction transistor
- Terms such as “providing,” “processing,” “supplying,” “determining,” “calculating” or the like may refer at least to an action of a computer system, computer program, signal processor, logic or alternative analog or digital electronic device that may be transformative of signals represented as physical quantities, whether automatically or manually initiated.
- controller may refer to, be embodied by or otherwise included within a machine, such as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed and programmed to perform or cause the performance of the functions described herein.
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA field programmable gate array
- a general purpose processor can be a microprocessor, but in the alternative, the processor can be a controller, microcontroller, or state machine, combinations of the same, or the like.
- a processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
- an LED driver circuit 20 as disclosed herein include an output block 24 rearranged so that it shares the same floating ground GND floating as a power factor correction (PFC) switching block 22 , and further includes a dimming control block 26 using a main ground GND main .
- PFC power factor correction
- an LED driver 20 includes a PFC switching block 22 which has its own floating ground GND floating .
- the entire output block 24 a is connected in series with resistor R 5 and switching element Q 1 , and has its own ground GND output .
- electrically speaking GND floating and GND output are the same point.
- the output current sensing signal I sense can be used to directly feedback to the controller IC for current regulation. No isolated signal coupler is needed for constant current control and the controller IC operations will be extremely simplified.
- the average voltage between controller IC ground (GND floating ) and mains ground (GND main ) must be zero in steady state, so that the low frequency voltage (input line frequency) at MULT pin (multiplier pin of power factor correction controller IC) is effectively proportional to the output of the input diode bridge rectifier D 1 -D 4 .
- the controller IC can therefore regulate the input current to follow the input voltage waveform to achieve its power factor correction goal.
- a high frequency noise filter capacitor C 5 is connected in parallel with resistor R 2 to filter out the high frequency noise coming from the primary winding L 3 p of the buck-boost inductor.
- the LED driver 20 further includes a dimming control block 26 a ( FIG. 2 ).
- V control is a dimming control voltage that can be changed by an external dimming signal (not shown).
- a resistor R 8 is added to the original current sensing circuit, in the present example coupled between the current sensing resistor R 6 and the error amplifier input terminals of the controller IC. R 8 and C 3 form a low pass filter. As a result, the voltage across capacitor C 3 (V C3 ) may be provided as a relatively pure DC signal with respect to the I sense feedback signal, which might otherwise have some small AC signal component.
- Resistor R 7 is provided within the dimming control block 26 a to superpose the dimming control voltage V control on capacitor C 3 .
- the voltage on capacitor C 3 follows the relation:
- V c ⁇ ⁇ 3 I sense ⁇ R 7 R 6 + R 7 + V control ⁇ R 6 R 6 + R 7
- V I_ref ⁇ _IC ⁇ _internal I sense ⁇ R 7 R 6 + R 7 + V control ⁇ R 6 R 6 + R 7
- the voltage across capacitor C 3 is the total current sensing signal I sense — total .
- the dimming control voltage V control changes, it follows that the total feedback signal I sense — total changes as well.
- the dimming control voltage V control is zero, the total feedback signal I sense — total is at its relative minimum value so that the output current will be at a relative maximum.
- the dimming control voltage V control is at its maximum value, the total feedback signal I sense — total is also at a relative maximum so that the output current will be at its relative minimum.
- C byoass is a capacitor that is capable of filtering out the high frequency voltage across the dimming control block 26 a .
- the high frequency voltage across the dimming control block 26 a is the voltage across the primary winding L 3 p of the buck-boost inductor.
- the filter capacitor C bypass as shown may therefore effectively ensure that all the high frequency voltage will be provided across the resistor R 7 .
- the primary difference is that the current sensing position in the exemplary output block 24 b shown is different.
- the current sensing signal in FIG. 2 is the real current signal, but the output is floating.
- the current sensing signal in FIG. 3 is the total current passing through the diode D 5 , but the AC current component is filtered out by capacitor C 2 which is coupled in parallel with the sensing resistor R 6 , so that the DC component will be the same as the current going through the LED load R 4 .
- the output has a reference point, which is the input diode bridge ground, GND main .
- This topology could offer a better output current waveform and EMI result.
- a lighting control system 40 may implement the concepts as described herein with respect to multi-channel floating IC driven buck boost converters. As shown in FIG. 4 , only one dimming control block 26 c and corresponding dimming control voltage V control is need for two or more channels with floating IC driven buck-boost converters 24 , since the current control circuit shares the same ground GND main .
- a first buck-boost converter having PFC switching block and output block may be provided as shown with resistor R 8
- one or more additional buck-boost converters including a second buck-boost converter having respective and otherwise equivalent PFC switching block and output block may be provided with additional respective resistors, e.g., R 10 , to provide the equivalent functionality as described above with respect to either of the previously disclosed embodiments in FIGS. 2 and 3 .
Abstract
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US14/589,000 US9237621B1 (en) | 2014-08-22 | 2015-01-05 | Current control circuit and method for floating IC driven buck-boost converter |
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US201462040466P | 2014-08-22 | 2014-08-22 | |
US14/589,000 US9237621B1 (en) | 2014-08-22 | 2015-01-05 | Current control circuit and method for floating IC driven buck-boost converter |
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Cited By (9)
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CN105792432A (en) * | 2016-04-19 | 2016-07-20 | 瑞金市得邦照明有限公司 | Drive circuit applicable to high-power energy-saving lamp |
CN106102237A (en) * | 2016-07-01 | 2016-11-09 | 安徽亮亮电子科技有限公司 | A kind of for LED delay illumination driving circuit |
CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
CN109005620A (en) * | 2018-08-01 | 2018-12-14 | 浙江凯耀照明股份有限公司 | A kind of LED drive circuit improving load regulation |
US10707746B1 (en) * | 2018-05-31 | 2020-07-07 | Universal Lighting Technologies, Inc. | Power converter with independent multiplier input for PFC circuit |
CN112367748A (en) * | 2020-12-14 | 2021-02-12 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
US11503689B1 (en) * | 2021-12-10 | 2022-11-15 | Hergy International Corp. | Circuit protection apparatus, snubber circuit, and method of operating circuit protection apparatus |
US20230012403A1 (en) * | 2021-07-08 | 2023-01-12 | ERP Power, LLC | Multi-channel led driver with integrated leds having a multilayer structure |
WO2023285124A1 (en) * | 2021-07-14 | 2023-01-19 | Signify Holding B.V. | Switch mode power converter |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105792432A (en) * | 2016-04-19 | 2016-07-20 | 瑞金市得邦照明有限公司 | Drive circuit applicable to high-power energy-saving lamp |
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CN106102237A (en) * | 2016-07-01 | 2016-11-09 | 安徽亮亮电子科技有限公司 | A kind of for LED delay illumination driving circuit |
CN108430133A (en) * | 2018-04-03 | 2018-08-21 | 帝奥微电子有限公司 | LED illumination driving circuit |
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CN109005620A (en) * | 2018-08-01 | 2018-12-14 | 浙江凯耀照明股份有限公司 | A kind of LED drive circuit improving load regulation |
CN112367748A (en) * | 2020-12-14 | 2021-02-12 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
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WO2023285124A1 (en) * | 2021-07-14 | 2023-01-19 | Signify Holding B.V. | Switch mode power converter |
US11503689B1 (en) * | 2021-12-10 | 2022-11-15 | Hergy International Corp. | Circuit protection apparatus, snubber circuit, and method of operating circuit protection apparatus |
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